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/*******************************************************************************
 * Copyright (c) 2000, 2008 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ui;

/**
 * Represents the context marked for the user in the navigation history.
 * 
 * Not intended to be implemented by clients. Clients should subclass NavigationLocation
 * instead.
 * 
 * @since 2.1
 * @noimplement This interface is not intended to be implemented by clients.
 */
public interface INavigationLocation {

    /**
     * Disposes of this location and frees any allocated resource.
     */
    public void dispose();

    /**
     * Release any state kept by this location. Any relevant state should be
     * saved by the previous call of saveState(IMemento). This object will
     * not be used until restoreState is called again. 
     */
    public void releaseState();

    /**
     * Persists the state of this location into the <code>memento</code>
     * 
     * @param memento the storage were the state should be saved into.
     */
    public void saveState(IMemento memento);

    /**
     * Restore the state of this location from the <code>memento</code>
     * 
     * @param memento the storage were the state was saved into.
     */
    public void restoreState(IMemento memento);

    /**
     * Restore the context saved by this location.
     */
    public void restoreLocation();

    /**
     * Merge the receiver into <code>currentLocation</code>. Return true if
     * the two locations could be merged otherwise return false.
     * <p> 
     * This message is sent to all locations before being added to the history;
     * given the change to the new location to merge itself into the current
     * location minimizing the number of entries in the navigation history.
     * </p>
     *  
     * @param currentLocation where the receiver should be merged into
     * @return boolean true if the merge was possible
     */
    public boolean mergeInto(INavigationLocation currentLocation);

    /**
     * Returns the input used for this location. Returns <code>null</code> if the
     * receiver's state has been released.
     * 
     * @return the input for this location
     */
    public Object getInput();

    /**
     * Returns the display name for this location.  This name is used in the
     * navigation history list.
     * 
     * @return the display name
     */
    public String getText();

    /**
     * Sets the location's input.
     * <p>
     * Should not be called by clients.
     * </p>
     * 
     * @param input the editor input.
     */
    public void setInput(Object input);

    /**
     * The message <code>update</code> is sent to the active location before
     * another location becomes active.
     */
    public void update();
}
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